<html>
<body>

<form action="/book/return" method="post">
    <center>
        <h2>
            还书申请
        </h2>
        <p>
            书Id: <input type="text" name="bookid">
        </p>
        <p>
            <input type="submit" value="还书">
        </p>
    </center>
</form>>
</body>
</html>